大侠,我向你提个中学题:(1-1⼀2^2)(1-1⼀3^2)(1-1⼀4^2)……(1-1⼀1004^2),简便计算方法

2024-12-03 04:02:04
推荐回答(4个)
回答1:

(1-1/2^2)(1-1/3^2)(1-1/4^2)……(1-1/1004^2),
=(1-1/1004^2)(1+1/004^2)
=答案自己算
望采纳!!!

回答2:

(1-1/2)(1+1/2)(1-1/3)(1+1/3)......(1-1/1004)(1+1/1004)=
(1/2*2/3*3/4*......1002/1003*1003/1004)(3/2*4/3*5/4*......1004/1003*1005/1004)
=1/1004*1005/2
=1005/2008

回答3:

用平方差公式,然后分组求积:(1-1/2)(1+1/2)(1-1/3)(1+1/3)......(1-1/1004)(1+1/1004)=
(1/2*2/3*3/4*......1002/1003*1003/1004)(3/2*4/3*5/4*......1004/1003*1005/1004)
=1/1004*1005/2
=1005/2008

回答4:

提示:把每个因式用平方差公式分解因式